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Investigation on polyvinyl butyral interlayered and ultrasonic vibration-assisted friction stir welded AA7075-T651 joints

  • Vaibhav S. Gaikwad (Department of Mechanical Engineering, Vishwakarma Institute of Information Technology) ;
  • Satish Chinchanikar (Department of Mechanical Engineering, Vishwakarma Institute of Technology)
  • Received : 2022.11.30
  • Accepted : 2024.10.21
  • Published : 2024.12.25
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Abstract

In this study, the performance of polyvinyl butyral interlayered friction stir welded (PVBFSWed) and ultrasonic vibration-assisted friction stir welded (UVaFSWed) AA7075-T651 joints are investigated, considering the effect of tool rotation and welding speed. The joints' tensile strength, microhardness, microstructure, and fracture behavior are evaluated. The UVaFSWed joints showed better performance compared to the PVBFSWed joints. The highest tensile strength of 322.8 MPa and microhardness of 157 Hv in weld nugget is observed for the UVaFSWed joint at a tool rotation of 2000 rpm and welding speed of 40 mm/min. However, the lowest surface roughness of 7.98 ㎛ was observed for the UVaFSWed joint at a tool rotation of 1400 rpm and welding speed of 40 mm/min. Comparatively lower tensile strength and microhardness were observed for the PVBFSWed joints compared to UVaFSWed joints. The fracture for the UVaFSWed and PVBFSWed joints mainly occurred in the heat-affected zone during the tensile test. The scanning electron microscopy (SEM) images show the more uniform, equiaxed grain distribution in the UVaFSWed joint.

Keywords

References

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